Movies 1-8. We present here the animations of selected collective modes intrinsically accessible to the two iGluRs. The movies are organized in pairs to allow for direct comparison of equivalent (similar) global modes between AMPAR (PDB id: 3KG2) and NMDAR (PDB id: 4PE5). Most movies are color-coded from blue (most rigid) to red (most mobile), except for a few cases colored by chain (subunit A: green; B: blue, C: magenta; D: yellow) for better visualization of the relative movements of the individual subunits. Below is the list of movies generated for either the full length receptors or the core structures.